CYLINDER AS-ETHER 1874851 - Caterpillar

Use this procedure to troubleshoot the electrical system if a problem is suspected with the sensors. Use this procedure if any of the diagnostic codes in Table 1 are active or easily repeated.
Table 1
J1939 Code and Description CDL Code and Description Comments
1761-3
Aftertreatment #1 DEF Tank Volume #1 : Voltage Above Normal 3130-3
Aftertreatment 1 Diesel Exhaust Fluid Tank Level : Voltage Above Normal The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
1761-4
Aftertreatment #1 DEF Tank Volume #1 : Voltage Below Normal 3130-4
Aftertreatment 1 Diesel Exhaust Fluid Tank Level : Voltage Below Normal The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
3031-3
Aftertreatment #1 DEF Tank Temperature : Voltage Above Normal 3134-3
Aftertreatment 1 Diesel Exhaust Fluid Tank Temperature : Voltage Above Normal The ECM detects signal voltage that is not in the acceptable range.
The code is logged.
3031-4
Aftertreatment #1 DEF Tank Temperature : Voltage Below Normal 3134-4
Aftertreatment 1 Diesel Exhaust Fluid Tank Temperature : Voltage Below Normal The ECM detects signal voltage that is not in the acceptable range.
The code is logged. The 5 VDC signal for the Diesel Exhaust Fluid (DEF) tank level sensor is routed to terminal 1 of the tank header unit. The 5 VDC signal for the DEF tank temperature sensor is routed to terminal 3 of the tank header unit. The sensor return is shared and is routed to terminal 2 of the tank header unit. The ECM provides short circuit protection for the internal power supply. A short circuit to the battery will not damage the internal power supply.Note: If both 1761-3 (3130-3) and 3031-3 (3134-3) codes are active at the same time, confirm that the "Aftertreatment #1 DEF Quality Sensor Installation Status" configuration parameter is programmed properly.The "Aftertreatment #1 DEF Quality Sensor Installation Status" parameter must be programmed to "Installed", if equipped with a DEF header having a 4-pin connector with an internal DEF quality sensor.Diagnostics on the Caterpillar Electronic Technician (ET)
Illustration 1 g03359107
Not all connectors are shown, refer to the appropriate schematic
The tank header unit houses the DEF tank temperature and the DEF tank level sensors. The sensors are not serviceable individually.Complete the procedure in the order in which the steps are listed.
Table 2
Troubleshooting Test Steps Values Results
1. Check for Diagnostic Codes
A. Establish communication between Cat® Electronic Technician (ET) and the Diesel Exhaust Fluid Controller (DCU) . Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Turn the keyswitch to the ON position.
C. Look for "-3" or "-4" active or logged codes.
Diagnostic Code
Result: A -3 diagnostic code is active.
Proceed to Test Step 2.
Result: A